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Does AC Affect Speed?

Published in Car AC Performance 2 mins read

Yes, using your car's air conditioning (AC) can affect its speed and acceleration.

How AC Impacts Car Performance

The primary reason why AC affects a car's speed is due to its impact on the engine's Revolutions Per Minute (RPM). When you turn on the AC, the system draws power from the engine. This power demand results in:

  • Reduced RPMs: According to the reference, the AC causes a drop in RPM. Lower RPMs mean less power is available to accelerate your vehicle.
  • Decreased Acceleration: Because you need higher revs to speed up, the reduced RPMs caused by the AC lead to a noticeable reduction in acceleration. This effect is particularly noticeable if you have a manual transmission or a car with a manual mode.

Testing the Effect of AC on Speed

You can easily observe this effect:

  • If you have a manual transmission, try accelerating with the AC on and off. You will likely feel a difference in how quickly the car speeds up.
  • If your car has an automatic transmission with manual mode, you can test the same thing, focusing on how the RPM responds to throttle input.

The effect may be more pronounced in smaller cars with smaller engines since the power demand from the AC is a greater proportion of the overall engine output.

Summary of AC and Speed Effects

Effect Explanation
RPM Drop AC uses engine power, reducing RPM.
Reduced Acceleration Lower RPMs lead to slower acceleration.

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